Three more Legendary Pokemon are coming to 'Pokemon Go'

Niantic

Three more Legendary Pokémon are coming to "Pokémon Go": Raikou, Entei, and Suicune.

The three Legendary dogs will each be available in different parts of the world for one month at a time. To kick things off, Raikou will be available in the Americas, Entei in Europe and Africa, and Suicune in the Asia-Pacific region starting August 31. They will rotate availability at the end of September and again at the end of October.

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For the past several weeks, four Legendary birds have been available through collaborative raid battles in Pokémon Go. These birds (Articuno, Moltres, Zapdos, and Lugia) will be phased out of the game to make way for the new Legendary dogs.

If you're unfamiliar with the original game series, Legendary Pokémon are ultra-powerful, incredibly rare creatures that are especially difficult to defeat in battle.

Additionally, Pokémon's most famous Legendary, Mewtwo, will be made available through special "EX" Raid Battles, which will require an in-game invitation to attend. "Pokémon Go" creator Niantic Labs said on Thursday that the first batch of EX battle invites will be sent out by September 6.

"Pokémon Go" is the fastest mobile game to reach $1 billion in revenue and has roughly 65 million monthly users globally.